"Why isn't fignum_exists() working on my plt subplot in Matplotlib?"

fignum_exists() not working on plt subplot

The fignum_exists() function in Matplotlib checks whether a figure with a given identifier exists. If it's not working on your plt subplot, there could be a few reasons:

Figure Identifier: Ensure that the figure identifier you're passing to fignum_exists() is correct. It should match the identifier used when creating the figure.

String Identifiers: If you're using string identifiers for your figures, fignum_exists() might not recognize them. This is a known issue in Matplotlib. You might need to use integer identifiers instead.

Subplot Creation: When creating subplots, ensure that each subplot has a unique identifier. If multiple subplots share the same identifier, fignum_exists() might not work as expected.

Scope and Context: Make sure that fignum_exists() is called in the correct context where the figure is accessible.